Merge pull request #917 from ueokande/operation-as-a-operator

refactor: Make each operation as an operator

1 files changed, 19 insertions, 0 deletions

diff --git a/src/background/operators/impls/SelectTabPrevOperator.ts b/src/background/operators/impls/SelectTabPrevOperator.ts
new file mode 100644
index 0000000..3776c1a
--- /dev/null
+++ b/src/background/operators/impls/SelectTabPrevOperator.ts
@@ -0,0 +1,19 @@
+import Operator from "../Operator";
+import TabPresenter from "../../presenters/TabPresenter";
+
+export default class SelectTabPrevOperator implements Operator {
+  constructor(private readonly tabPresenter: TabPresenter) {}
+
+  async run(): Promise<void> {
+    const tabs = await this.tabPresenter.getAll();
+    if (tabs.length < 2) {
+      return;
+    }
+    const tab = tabs.find((t) => t.active);
+    if (!tab) {
+      return;
+    }
+    const select = (tab.index - 1 + tabs.length) % tabs.length;
+    return this.tabPresenter.select(tabs[select].id as number);
+  }
+}